Blacklock, who was the co-Big 12 Defensive Freshman of the year and a FWAA Freshman All-American last season, was injured during a non-contact drill on Tuesday. The 6-foot-4, 330-pound lineman had 27 tackles, two sacks and 6.5 tackles for loss last year, and is widely considered a NFL prospect.

According to 247Sports, redshirt freshman Terrell Cooper has taken Blacklock’s place so far in practice. He reportedly has had multiple “good practices,” and has been mentioned several times by coach Gary Patterson this offseason as a player who has impressed, too.

The Horned Frogs open up their season on September 1 against Southern.